package com.ror.java.se.operator;

import java.io.IOException;
import java.util.Scanner;

public class Demo01 {
    public static void main(String[] args) throws IOException {
        Scanner sc = new Scanner(System.in);
        int a = Integer.parseInt(sc.next());
        Object o = a == 1 ? 2 : "no";
        System.out.println(o);
        sc.close();
    }
}
